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A film capacitor may be equipped to the resonant circuit in a wireless charger. Below, we give the results of an evaluation we conducted in which we replaced such film capacitor with MLCCs.
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We obtained commercially available wireless chargers and then conducted an evaluation in which we replaced the film capacitor with MLCCs. The film capacitor is equipped as a resonance capacitor to the part in the red circle in the photograph below.
Our plan to replace the film capacitor with MLCCs is shown below. The replacement product is GRM3195C2A104JA01 (1206M, C0G, 0.1uF, 100V).
Film capacitor: 7.3×6.5mm, 0.33uF, 63V → MLCCs: GRM3195C2A104JA01 (1206M, C0G, 0.1uF, 100V)×4pcs
We confirmed the characteristics below during charging before and after replacing the film capacitor with MLCCs.
Evaluation Items (1) Rise in temperature on the surface of the film capacitor (2) Power conversion efficiency
We were able to confirm a difference in the rise in temperature of at least 20°C between the film capacitor and the MLCCs in this measurement.
The MLCCs have a lower ESR than the film capacitor, which means it is possible to keep the rise in temperature low.
We evaluated the power conversion efficiency during charging by using the above film capacitor.
We confirmed that the power conversion efficiency of the MLCCs is at least 2% better than the film capacitor in this evaluation.
We confirmed the characteristics below during charging before and after replacing the film capacitor with the MLCCs. (1) Rise in temperature on the surface of the film capacitor (2) Power conversion efficiency
We confirmed that the MLCCs have a lower ESR than the film capacitor and that the difference in the rise in temperature is at least 20°C between the film capacitor and the MLCCs.
We confirmed that the power conversion efficiency of the MLCCs is at least 2% better than that of the film capacitor.
A simple comparison of the MLCCs and film capacitor shows that the MLCCs are more suitable for downsizing and contribute to a reduction in the mounting surface.
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